OR Simplex Step-by-Step is a free Android application developed by Simplex Developers. It is an efficient commenting-enabled solver for operational research, which has been verified by professors of Kyiv Polytechnic University. The application offers a range of features that make it stand out from its competitors.

The key features of the application include the Simplex Algorithm with two-phase and branch and bound methods, graphs for LP, integer solutions, sensitivity and post-optimal analysis, transportation problem solving using different methods, MODI Method - UV Method, assignment problem solving using the Hungarian Algorithm, sequencing problem solving using Johnson's Algorithm, multilingual support, and offline functionality. Compared to other similar applications, OR Simplex Step-by-Step offers a more comprehensive and user-friendly experience.